CN101312017B - Image display apparatus and its image display process - Google Patents

Abstract

The invention provides an image display device, which aims at resolving the problems of high electricity consumption, insufficient contrast, twinkling image and distortion in image display devices. The image display device includes an image display management module which comprises a backlight control unit, the backlight control unit comprises an image brightness analyzer that can generate a brightness value according to the inputted viewdata, a weight generator which can generate one weight according to the brightness value, an image variance analyzer which can analyze the inputted viewdata to generate one image variance value and a backlight factor generator which can be coupled with the weight generator and the image variance analyzer to generate backlight regulatory signal according to the weight and the image variance value. By virtue of the backlight regulatory signal, the image display device can realize the efficacy of power saving and contrast enhancement.

Description

Image display and image display method

Technical field

The present invention system is about a kind of image display and method; More specific says, the present invention is a kind of liquid crystal indicator of relation and method.

Background technology

(Liquid Crystal Display LCD) is implemented in computing machine, laptop computer, TV and the various electronic product LCD at large.The LCD of convention has the shortcoming of two maximums, and one is the consumption of electric power, and another then is the deficiency of contrast.In electronic product, the electric power that LCD consumed can reach 30% to 70% of wastage in bulk or weight electric power, and the part of power consumption is a back lighting device wherein, therefore needs the back lighting device of a power saving that the LCD of one low consumption electric power is provided.And the problem of insufficient contrast is especially obvious when LCD shows darker image, owing to image partially secretly makes image to show with backlight presenting a contrast, therefore needs a LCD that can when image is dark partially, still can keep contrast.

For solving above-mentioned problem, prior art comprises that one has the video display of backlight control, and it is according to the average brightness value and the maximum brightness value of input image information, and is backlight to control.But because this technology does not have the adjustment image that front panel showed, therefore the amplitude of contrast is still not enough; And the image analysing computer in its backlight control apparatus is too simple, and the information of being analyzed can not be represented the characteristic of input image information.Another prior art, to improve the analyzing defect of above-mentioned technology, it produces the brightness histogram of input image according to the input image information, and it is backlight to utilize histogram to regulate.Though this kind analysis is to improve the shortcoming of aforementioned techniques, this analyzes the characteristic that still can't actually show the input image.And only utilize histogram analysis to be prone to make adjusted image to produce scintillation effect, or make image distortion.

Therefore, need a kind of image display to solve the problem of above-mentioned high power consumption, insufficient contrast, image flicker and distortion.

Summary of the invention

For solving above-mentioned problem, the present invention provides a kind of image display management module, and it comprises a backlight control unit, and this backlight control unit comprises the image brilliance analyzer, and it imports image data so that produce a brightness value according to one; One weights generator, it is according to one of this brightness value generation weights; One image analysis of variance device, it is analyzed this input image data and produces an image variation value; And a factor generator backlight, itself and this weights generator and the coupling of this image analysis of variance device are so that produce a conditioning signal backlight according to these weights and this image variation value.

The present invention provides a kind of method of compensation one input image data, and this method is by an image brilliance analyzer, and decision should be imported one of the image data brightness value; By a weights generator so that produce weights for this luminance graph value; By an image analysis of variance device, analyze this input image data so that produce an image variation value; By a factor generator backlight, produce a conditioning signal backlight according to these histogram weights and this image variation value; And the image output that produces a compensation according to this conditioning signal backlight and from one of image control module image output data.

The present invention provides a kind of image display management module, and it comprises an image control module, and this image control module comprises a low-pass filter, its input image data that is used to atomize; One gain factor selector switch, itself and this low-pass filter is coupled so that determine a gain factor; And an output data generator, its and this gain factor selector switch is coupled so that produce an image output data.

The present invention provides a kind of method of compensation one input image data, and this method comprises by low-pass filter atomizing one input image data; Determine a gain factor by a gain factor selector switch according to the input image data of this atomizing; Produce an image output data by an output data generator according to this gain factor and this input image data; And the image output that produces a compensation according to this image output data and from one of backlight control unit conditioning signal backlight.

Description of drawings

Fig. 1 is the synoptic diagram of a kind of image display management module according to the present invention.

Fig. 2 a-2d is the luminance signal histogram one of according to the present invention.

Fig. 3 is the process flow diagram of a kind of calculating conditioning signal method backlight according to the present invention.

Fig. 4 is the synoptic diagram of the another kind of image display management module according to the present invention.

Fig. 5 is the process flow diagram of a kind of calculating image output document method according to the present invention.

Fig. 6 is the synoptic diagram of the another kind of image display management module according to the present invention.

Embodiment

Below will the present invention more fully be described with reference to the accompanying drawing of the specific embodiment that shows the present invention.Yet the present invention should not be regarded as being limited to the specific embodiment that this paper proposes.More exactly, provide the said specific embodiment that waits, and the category that will pass on the present invention fully is to being familiar with this operator so that this disclosure is with comprehensive and complete.In graphic, for the sake of clarity and the thickness in exaggerative each layer and zone.In all were graphic, same numbers referred to same components.Term used herein " and/or " comprise one or more project any of the listed items that is associated and all combinations.

Term used herein is based on the purpose that certain specific embodiments only is described, and does not hope to limit the present invention.Singulative used herein " one ", " one " reach " said " and also comprise plural form, only if background is clearly indicated other situation.Should further understand: term " comprises " and/or " comprising " regulation when being used for this instructions exists said characteristic, integer, step, operation, assembly and/or assembly, but does not get rid of existence or increase one or more further feature, integer, step, operation, assembly, assembly and/or its group.

Should be appreciated that when mean such as one of one deck or zone assembly " " or extend " extremely " another assembly " on " time, its can be directly or directly extend on another assembly, or also can have intermediary's assembly.On the contrary, when an assembly mean " directly existing " or " directly extending to " another assembly " on " time, then do not have intermediary's assembly.Also should be appreciated that when an assembly means and " be connected " with another assembly or when " coupling ", it can directly be connected with another assembly or be coupled, and maybe can have intermediary's assembly.On the contrary, " directly be connected " with another assembly or when " directly coupling ", then do not have intermediary's assembly when an assembly means.

Should be appreciated that, wait term should not limit said assembly, assembly, zone, layer and/or the section of waiting though first, second grade of term can be used to explain various assemblies, assembly, zone, layer and/or section in this article, and is said.The said term system that waits only is used for assembly, assembly, zone, layer or a section and another assembly, assembly, zone, layer or section are distinguished.Therefore, below one of explanation first assembly, assembly, zone, layer or section can be described as one second assembly, assembly, zone, layer or section, and the principle that does not break away from the present invention.

In addition, for example " lower ", " base " or " level " reach the relative terms at " higher ", " top " or " vertically ", can be used for explaining a graphic assembly of explaining orally and the relation of another assembly in this article.Should be appreciated that, except that graphic described orientation, hope that relative terms comprises the different azimuth of said device.For example, if put upside down the device in graphic, then be illustrated as at the assembly on it " lower " side of other assembly and will be oriented in said the grade on it " higher " side of other assembly.Therefore, exemplary term " lower " can comprise the orientation that " lower " reaches " higher ", and this depends on graphic particular orientation.Likewise, if put upside down one of graphic device in graphic such as said, then be illustrated as other assembly " below " or the assembly of " below " will be oriented in said wait other assembly " above ".Therefore exemplary term " following " or " below " can comprise top orientation and following orientation.

The present invention's specific embodiment is explained in the section diagram of schematically explaining orally that this paper is referenced as the present invention's idealized specific embodiment.Therefore, for example can expect that graphic shape changes because of manufacturing technology and/or tolerance.Therefore the present invention's specific embodiment should not be regarded as being limited to the illustrated specific region shape of this paper, and should comprise the form variations that for example produces because of manufacturing.For example, explain orally or be illustrated as one of conical region zone and have a rounded vertex and coarse and/or nonlinear characteristic usually.Therefore, the zone such as said of explaining orally among the figure has illustrative nature, and does not hope that its shape explains orally the accurate shape in a zone and limit the present invention's category.In addition, the term indication that reaches " vertically " such as " level " remove accurate 0 spend or one of the 90 degree orientation as direction or relation.

Unless in addition definition, whole term used herein (comprising technology and scientific terminology) have with the present invention under have the knack of the common identical connotation of understanding person of technological personage institute.The term that should further understand such as the defined term of universaling dictionary should be regarded as having the connotation consistent with its connotation in the background of correlation technique, and should not be regarded as having idealized or excessive formal meaning, only if this paper so clearly defines.

Fig. 1 is the synoptic diagram of a kind of image display management module 100 according to the present invention, and this image display management module 100 comprises backlight control unit 110.This backlight control unit 110 comprises the image brilliance analyzer, and an image brilliance analyzer utilizes a histogram generator 101 to implement according to this in this embodiment; Weights generator 102; Image analysis of variance device 103; And factor generator 104 backlight.Wherein histogram generator 101 is to be connected in weights generator 102, and weights generator 102 is to be connected in factor generator 104 backlight; And image analysis of variance device 103 is connected in factor generator 104 backlight similarly.

Histogram generator 101 in the backlight control unit 110 produces histogram value H, and histogram value H is sent to weights generator 102 according to input image data I.102 of weights generators calculate weights W according to histogram value, and weights W is sent to factor generator 104 backlight.And image analysis of variance device 103 produces image variation value Var according to input image data I, and likewise image variation value Var is sent to factor generator 104 backlight.104 of factor generators backlight produce conditioning signal BL backlight according to weights W that is received and image variation value Var.And image display management module 100 can be directly according to the conditioning signal BL display backlight backlight that is sent to display 130; Use by adjusting backlight and manage the image demonstration; Or after again conditioning signal BL backlight being handled via an image control module 120, be resent to display 130.

The input image data is usually by red (red), and green (green) and blue (blue) tristimulus signal constitute.The intensity of each chrominance signal is divided into 256 GTGs, for any input picture, can produce histogram to three chrominance signals respectively.Fig. 2 a, 2b, 2c provide the histogram of three looks respectively.Can obtain brightness signal Y and the carrier chrominance signal U and the V of image by tristimulus signal.Brightness signal Y can obtain through following formula with colourity signal U and V

Y＝0.229×R+0.587×G+0.114×B

U＝-0.147×R-0.289×G+0.437×B

V＝0.615×R-0.515×G-0.1×B

Brightness signal Y also is divided into 256 GTGs, thus, can obtain the histogram 2d of luminance signal.The weights generator can go out weights W according to the histogram calculation of this luminance signal according to 102.

The adjusting principle of conditioning signal BL backlight does, when image is dark or brightness when placed in the middle, dims backlight; When image comprises bright for brighter, image and dark-part or image when comprising mean flow rate, lighten backlight.Because the histogram of image is the Luminance Distribution of show image roughly only, therefore need further calculate the Luminance Distribution variation of image.Fig. 3 is flow process Figure 30 0 of a kind of calculating conditioning signal BL method backlight according to the present invention.At first, calculate the image variation value Var that imports image data I in step 301, it calculates system and utilizes formula 1.

$\mathrm{Var}=\frac{1}{M\×N}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{\left[I(i,j-\stackrel{\‾}{I})\right]}^2$ Formula 1

Wherein

$\stackrel{\‾}{I}=\frac{1}{M\×N}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}\underset{j=1}{\overset{N}{\mathrm{\Σ}}}I(i,j)$ Formula 2

Wherein M * N represents the size of image; (i then is to represent the position of each pixel in image j) to I.The brightness value H of step 302 a calculating input image data I, then at the weights W of step 303 generation brightness value H, it calculates is to utilize formula 3, wherein image minimum value W backlight _MinIt then is a predetermined value.

$W=\frac{(1-W_{\mathrm{Min}})\×\stackrel{\‾}{I}}{255}+W_{\mathrm{Min}}$ Formula 3

And

W∈[0.7，1]

Whether step 304 a comparison image variation value Var is greater than image variation critical value V _ThLong-pending with weights W; If confirm that to step 305 conditioning signal BL backlight promptly is weights W; If not, then confirm that to step 306 conditioning signal BL backlight is one of a weights W and image variation value Var function, this function can represent with formula 4, wherein image variation critical value V _ThIt then is a predetermined value.

$\mathrm{BL}=g(W,\mathrm{Var})=W-\frac{(V_{\mathrm{Th}}\×W-\mathrm{Var})}{3\×V_{\mathrm{Th}}\×W}$ Formula 4

Result by flow process 300 can know, when the variation of input image data I hour, conditioning signal BL backlight is less than weights W; And when the variation of importing image data I was big, conditioning signal BL backlight approximated weights W greatly.Therefore image display management module 100, dims backlight than mean time in the brightness of input image, to save the consumption of electric power; And when the Luminance Distribution of image makes a variation greatly, lighten backlight, to increase the generation that contrasts and avoid scintillation effect.

Fig. 4 is the synoptic diagram of a kind of image display management module 400 according to the present invention, and this image display management module 400 comprises image control module 420.This image control module 420 comprises low-pass filter 405; Gain factor selector switch 406; And output data generator 407.Wherein low-pass filter 405 is to be connected in gain factor selector switch 406, and gain factor selector switch 406 is to be connected in output data generator 407.

Low-pass filter 405 in the image control module 420 will be imported the high frequency filtering among the image data I.In other words, through the image data of filtrations can be similarly be through the atomizing processing import image data I, or arround image data A.This measure can reduce handling data quantity, and can be to handling for the image data of sensitivity backlight.Arround image data A be sent to gain factor selector switch 406 from low-pass filter 405,406 of gain factor selector switchs can be by the logic like Fig. 4 institute example methodology, according to arround image data A decision gain factor f.And gain factor f is sent to output data generator 407 from gain factor selector switch 406.407 of data generators of output produce image output data RecI according to gain factor f.And image display management module 400 is sent to display with image output data RecI, makes the display can be according to image output data RecI show image.

Fig. 5 is flow process Figure 50 0 of a kind of calculating image output data RecI method according to the present invention.In step 501, image data A arround input image data I obtains through low-pass filter 505; Step 502 item be gain factor selector switch 506 according to arround image data A calculated gains factor f.It is to utilize formula 5 that gain factor f must calculate, wherein image variation critical value A ₀It then is a predetermined value.

$f(i,j)=\frac{F_{\mathrm{Max}}-F_{\mathrm{Min}}}{A_{\mathrm{Min}}-{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="S071A3749920070601E000022.png,S071A3749920070601E000024.png"\; state="\{\{state\}\}">A</figure-callout>}}_0}\&times;A(i,j)+\frac{F_{\mathrm{Min}}\&times;A_{\mathrm{Min}}-F_{\mathrm{Max}}\&times;A_0}{A_{\mathrm{Min}}-{\mathrm{<figure-callout\; id="0"\; label="A"\; filenames="S071A3749920070601E000022.png,S071A3749920070601E000024.png"\; state="\{\{state\}\}">A</figure-callout>}}_0}$ When A (i, j)＜A ₀

$=F_{\mathrm{Min}}$ When A (i, j)>=A ₀Formula 5

F wherein _MinAnd F _MaxBe defined as

$F_{\min }=\frac{255\&times;\mathrm{BL}}{I_{\max }}<1$

$F_{\max }=2-{{\mathrm{<figure-callout\; id="1"\; label="F\; min"\; filenames="S071A3749920070601E000011.png"\; state="\{\{state\}\}">F</figure-callout>}}_{\min }}^{1/4}>1$

In step 503, whether the maximal value of relatively importing image data I multiply by conditioning signal BL backlight smaller or equal to 255; If confirm that to step 504 image output data RecI promptly is that input image data I is divided by conditioning signal BL backlight; If not, then confirm that to step 505 image output data RecI is for importing the long-pending divided by conditioning signal BL backlight of image data I and gain factor f.By the calculating of flow process 500, image output data RecI can be according to the adjustment of the intensity of conditioning signal BL backlight, therefore can avoid the saturated of extremely dark and incandescent place in the image, makes image not with distortion.

Fig. 6 is the synoptic diagram of a kind of image display management module 600 according to the present invention; Wherein comprise like above-mentioned backlight control unit 610 and image control module 620, wherein backlight control unit 610 is the output data generator 607 that is connected to image control module 620 via factor generator 604 backlight.Therefore exporting data generator 607 is according to gain factor f and conditioning signal BL backlight, calculates image output data RecI.And image display management module 600 is sent to display with image output data RecI and conditioning signal BL backlight, and making the backlight of display is image output data RecI according to the image that conditioning signal BL backlight shows and front panel showed.

Claims (8)

1. image display management module, it comprises a backlight control unit, and this backlight control unit comprises:

One histogram generator, its according to one the input picture image data so that produce a brightness histogram;

One weights generator, it sets corresponding weights based on a plurality of brightness value of image in advance, further this weights generator and this histogram generator coupling generation one and the corresponding weights of this input picture;

One image analysis of variance device, it is analyzed the image data of this input picture and produces an image variation value; And

One factor generator backlight; Itself and this weights generator and the coupling of this image analysis of variance device are so that produce a conditioning signal backlight according to these weights and this image variation value of this input picture; Wherein if the image variation value of the image data of this input picture during less than the product of image variation critical value and these weights; This conditioning signal backlight is less than weights, otherwise this conditioning signal backlight equals this weights.

2. according to the image display management module of claim 1, it further comprises an image control module, and this image control module comprises:

One low-pass filter, it is used for this input image data of atomizing;

One gain factor selector switch, itself and this low-pass filter are coupled so that produce more than a gain factor according to image data that atomizes and conditioning signal backlight; And

One output data generator; Itself and this gain factor selector switch and this factor generator coupling backlight are so that produce an image output data; Wherein if the maximal value of input image data multiply by this conditioning signal backlight smaller or equal to the maximal value of importing image data form ash exponent number; This image output data for this input image data divided by this conditioning signal backlight, otherwise this image output data for this product of importing image data and this gain factor divided by this conditioning signal backlight.

3. according to the image display management module of claim 1, wherein the coupling of this weights generator and this histogram generator comprises:

One mean flow rate according to histogram generation input picture; And

One weights generator produces corresponding weights with picture based on this average brightness value.

4. according to the image display management module of claim 3, wherein this image analysis of variance device calculates according to said average brightness value.

5. video display that contains the image display management module of with good grounds claim 1 or 2, its according to this image output data and this conditioning signal backlight so that produce the image output of a compensation.

One kind the compensation one the input image data method, this method comprises the following step:

By a histogram generator, determine a brightness histogram of this input image data;

By a weights generator so that produce weights according to this brightness histogram;

By an image analysis of variance device, analyze this input image data so that produce an image variation value;

By a factor generator backlight; Produce a conditioning signal backlight according to these histogram weights and this image variation value; Wherein if the image variation value of this input image data during less than the product of image variation critical value and these weights; This conditioning signal backlight is less than weights, otherwise this conditioning signal backlight equals this weights; And

Produce the image output of a compensation according to this conditioning signal backlight and from an image output data of an image control module.

7. according to the method for claim 6; Wherein this image output data system is by an output data generator; Produce with this conditioning signal backlight according to a plurality of gain factors, this input image data; Wherein if the maximal value of this input image data multiply by this conditioning signal backlight smaller or equal to the maximal value of importing image data form ash exponent number; This image output data for this input image data divided by this conditioning signal backlight, otherwise this image output data for this product of importing image data and this gain factor divided by this conditioning signal backlight.

8. according to the method for claim 6 or 7, wherein this gain factor system is by a gain factor selector switch, and this input image data that has atomized of handling via a low-pass filter produces.

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